| Abstract |
This paper describes all the disturbances resulting from induction heating equipment, and practical methods to deal with the problems in order that induction heating processes can handle disturbances by themselves, and be made more cost-effective. After a great number of measurements and a detail study to a lot of industrial installations, principal mechanisms of the interferences have been revealed. For harmonic distortion, useful solutions have been proposed, some of which are industrially tested or used by manufacturers. The proposed dual Steinmetz Bridge can thoroughly resolve both capacitor switching problem and harmonic amplification in a non-linear load or in a polluted network. A current type inverter is particularly realized in 'spread' type for the high frequency study. On basis of interference mechanisms, practical solutions such as damping reactor, common mode current bypass, and non-linear snubber have been proposed and confirmed in a 'compacted' type inverter. The best way for attenuating the interferences is to dispose at sources and transform them into thermal energy. By understanding mechanism, we can always find some pre-measures to deal with the problems, which are undoubtedly cheaper than that of post-remedies. |
